raftsman

The Neckar is in many places so narrow that a person can throw a dog across it, if he has one; when it is also sharply curved in such places, the raftsman has to do some pretty nice snug piloting to make the turns.

I heard the whoop again; it was behind me yet, but in a different place; it kept coming, and kept changing its place, and I kept answering, till by and by it was in front of me again, and I knowed the current had swung the canoe's head down-stream, and I was all right if that was Jim and not some other raftsman hollering.

The book includes the complete text of a first-person account of a first-time river raftsman named Ceylon Childs Lincoln, along with an extensive glossary of rivercraft and navigation terms.